PODJRID^. 



625 



cles, adding that "it is very unusual for an articulate animal 

 to have only two spiracles, and their position is still more ex- 

 traordinary, for they open on the under side of the head, 

 immediately below the autenuije, ... on the 

 inner side of the basis of the mandibles." 

 "In the manner of subdivisions the tracheje 

 of Smynthurus differ from those of the true in- 

 sects, and agree more closely with the Myrio- 

 poda and tracheal Arachnida, in the fact that 

 the}- do not often give otf branches nor form 

 tufts, but generally divide dichotomously, and 

 run considerable distances without a separa- 

 tion." (Mr. Lubbock, whom we have just 

 quoted, states that Papirius has no trachea?.) 

 In Smynthurus the ovaries consist, according 

 to Lubbock, of a single egg-tube. Ou the un- 

 derside of the abdomen is a sucking tube, slen- Fig. 6in. 



der and forked in Smynthurus, but 

 short in Podura, etc., by w^hich the 

 animal adheres to smooth surfaces. 

 In the genus Podura the bodj^ is 

 long, with four-jointed antennae, and 

 the flexible spring-tail is short, while 

 in Desoria, which is found in the 

 Alps, the tail is long. The genus 

 Degeeria is known by the ovate body, 

 and basal half of the spring equal-- 

 ling the fork in _.,,,,„, „.,, 

 length. A species M/ft/W^ 



(Fig. m^) Lay ipy^Aim 



resembling the European D. nivalis Nicolet, 



we have found in summer 



leaves of the Clematis. Tlie L 



binos Nic. (Fig. 620) is a minute pearlj 



species found in Europe ; its scales (Fig. 



621) are thin and with distinct markings. 



Smynthurus is short, differing great I3' in 

 form from Podura, and bears a striking resemblance to the 

 larva of Coniopteryx. The body is short, nearly spherical, and 

 40 



resting „„ the!;; , lltlll! i 



Lite pearly white fell! !!:!'l(i WO 



Fig. 621. 



